US3684461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for use in the work-up of waste water containing phosphorus sludge
Assignee: KARL HEINZ STENDENBACH
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Filing: 1969-11-12
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Granted: 1972-08-15
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Expires: 1989-11-12
Abstract
Abstract PROCESS FOR THE CONTINUAL WORK-UP OF WASTE WATER HAVING PHOSPHORUS SLUDGE THEREIN, SUCH AS THAT OBTAINED IN THE ELECTROTHERMAL PRODUCTION OF PHOSPHORUS. THE WASTE WATER IS FIRST FILTERED IN A FILTRATION ZONE, THE RESULTING FILTER CAKE IS PREDRIED IN A PRELIMINARY DRYING ZONE, THE PREDRIED FILTER CAKE IS CONVEYED THROUGH AT LEAST TWO ADDITIONAL DRYING ZONES MAINTAINED AT TEMPERATURES BETWEEN ABOUT 100 AND 380*C., GASEOUS AND VAPOROUS MATTER ISSUING FROM SAID ADDITIONAL DRYING ZONES IS DELIVERED TO A CONDENSATION ZONE, THE PHOSPHORUS AND WATER ARE CONDENSED THEREIN AND SEPARATELY REMOVED THEREFROM.
Inventors
- 👤 Fritz Muller
- 👤 Karl-Heinz Stendenbach
- 👤 Horst-Heinrich Weizenkorn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:51
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/003; C01B25/01; C02; C02F; C02F11/00; C02F11/12; C02F11/13; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/906
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |